Texas Instruments

UCC3946DTR

The UCC3946DTR is a high-voltage, high-power factor, offline PWM controller from Texas Instruments. It is specifically designed for use in offline power supply applications, such as AC-DC power adapters and chargers.

Description:

The UCC3946DTR is a monolithic high-power factor (HPF) controller that integrates all the primary side control functions required for offline applications. It is a current mode PWM controller with a fixed 130 kHz switching frequency, which allows for easy EMI filtering and design optimization.

Features:

1. High-voltage operation: The UCC3946DTR can operate with input voltages up to 380VAC, making it suitable for a wide range of power supply applications.
2. High-power factor: The controller is designed to achieve high-power factor operation, which is essential for meeting energy efficiency standards and reducing energy consumption.
3. Current mode control: The UCC3946DTR uses current mode control, which provides fast transient response and excellent line and load regulation.
4. Fixed switching frequency: A fixed 130 kHz switching frequency allows for easy EMI filtering and design optimization.
5. Protection features: The controller includes various protection features, such as over-voltage protection (OVP), over-current protection (OCP), and over-temperature protection (OTP), to ensure reliable and safe operation.
6. Green mode operation: The UCC3946DTR supports green mode operation, which reduces energy consumption during light load conditions.

Applications:

1. AC-DC power adapters
2. AC-DC chargers
3. TV power supplies
4. Computer power supplies
5. Telecommunication power supplies
6. Industrial power supplies

In summary, the UCC3946DTR is a versatile and feature-rich PWM controller from Texas Instruments, designed for high-voltage, high-power factor offline power supply applications. Its current mode control, fixed switching frequency, and comprehensive protection features make it suitable for a wide range of power supply applications, including AC-DC adapters, chargers, and various industrial and telecommunication power supplies.